SPEECH ENCODING DEVICE - NTT DOCOMO INC

Title:

SPEECH ENCODING DEVICE

Document Type and Number:

Japanese Patent JP2016197254

Kind Code:

A

Abstract:

PROBLEM TO BE SOLVED: To recover speech quality without increasing an algorithm delay for a packet loss in speech encoding.SOLUTION: Provided is a speech encoding device for encoding a speech signal, comprising a speech encoding unit for encoding a speech signal and an auxiliary information encoding unit for calculating the parameter of a lookahead signal in CELP encoding as auxiliary information used for packet loss concealment in CELP encoding. The speech encoding unit calculates an index representing the nature of a frame to be encoded and transmits it to the auxiliary information encoding unit, a pitch lag is included as auxiliary information in a packet immediately preceding a packet to be decoded for only a specific frame class and the pitch lag is not included for frame classes other than the specific frame class.SELECTED DRAWING: Figure 4

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Inventors:

TSUTSUMI KIMITAKA
KIKUIRI KEI
YAMAGUCHI TAKASHI

Application Number:

JP2016135137A

Publication Date:

November 24, 2016

Filing Date:

July 07, 2016

Export Citation:

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Assignee:

NTT DOCOMO INC

International Classes:

G10L19/00; G10L19/005; G10L19/12; H04L1/00

Domestic Patent References:

JP2004138756A	2004-05-13
JPH08160993A	1996-06-21
JP2008040157A	2008-02-21

Attorney, Agent or Firm:

Yoshiki Hasegawa
Yoshiki Kuroki
Takashi Okiyama
Kenji Fukaishi

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